Sears Canada CEO Calvin McDonald has resigned from his position for a new job opportunity. The move comes in the midst of a three-year restructuring initiative to strengthen the retailer's position in the region against new competition from Target and Wal-Mart.

Previous executive VP and COO Douglas C. Campbell, who is also a retired Marine Corps officer, took his place as CEO and president, as well as a member of the company's board of directors, effective Tues., Sept. 24.